The essential oils of 27Eucalyptusspecies of Moroccan origin have been examined using GC and GC/MS. Forty constituents were identified in the oils, although full chemical characterization of each oil was not achieved. Fifteen of the 27 species investigated were found to possess an oil rich in 1,8-cineole (>40%). In four species,E. globulus, E. melliodora, E. siderophloiaandE. maideni, the 1,8-cineole content exceeded 70% while the α-phellandrene percentage was less than 1%.E. citriodorawas found to possess an oil rich in citronellal (56%) whileE. maculatapossessed an oil rich in α-pinene (70%).